rust: jump_label: skip formatting generated file

After a source tree build of the kernel, and having used the `RSCPP`
rule, running `rustfmt` fails with:

    error: macros that expand to items must be delimited with braces or followed by a semicolon
     --> rust/kernel/arch_static_branch_asm.rs:1:27
      |
    1 | ...ls!("1: jmp " ... ".popsection \n\t")
      |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      |
    help: change the delimiters to curly braces
      |
    1 | ::kernel::concat_literals!{"1: jmp " ... ".popsection \n\t"}
      |                           ~                                ~
    help: add a semicolon
      |
    1 | ::kernel::concat_literals!("1: jmp " ... ".popsection \n\t");
      |                                                             +

This file is not meant to be formatted nor works on its own since it is
meant to be textually included.

Thus skip formatting it by prefixing its name with `generated_`.

Cc: Masami Hiramatsu <[email protected]>
Cc: Alex Gaynor <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Gary Guo <[email protected]>
Cc: Björn Roy Baron <[email protected]>
Cc: Benno Lossin <[email protected]>
Cc: Andreas Hindborg <[email protected]>
Cc: Alice Ryhl <[email protected]>
Cc: Trevor Gross <[email protected]>
Link: https://lore.kernel.org/[email protected]
Fixes: 169484a ("rust: add arch_static_branch")
Signed-off-by: Miguel Ojeda <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

Author: ojeda

rust/Makefile

@@ -36,7 +36,7 @@ always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c
 obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.o
 obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.o
 
-always-$(subst y,$(CONFIG_RUST),$(CONFIG_JUMP_LABEL)) += kernel/arch_static_branch_asm.rs
+always-$(subst y,$(CONFIG_RUST),$(CONFIG_JUMP_LABEL)) += kernel/generated_arch_static_branch_asm.rs
 
 # Avoids running `$(RUSTC)` for the sysroot when it may not be available.
 ifdef CONFIG_RUST
@@ -427,7 +427,7 @@ $(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \
 	+$(call if_changed_rule,rustc_library)
 
 ifdef CONFIG_JUMP_LABEL
-$(obj)/kernel.o: $(obj)/kernel/arch_static_branch_asm.rs
+$(obj)/kernel.o: $(obj)/kernel/generated_arch_static_branch_asm.rs
 endif
 
 endif # CONFIG_RUST

rust/kernel/.gitignore

@@ -1,3 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
 
-/arch_static_branch_asm.rs
+/generated_arch_static_branch_asm.rs

rust/kernel/arch_static_branch_asm.rs.S rust/kernel/generated_arch_static_branch_asm.rs.S

@@ -39,7 +39,7 @@ pub use static_branch_unlikely;
 #[cfg(CONFIG_JUMP_LABEL)]
 const _: &str = include!(concat!(
     env!("OBJTREE"),
-    "/rust/kernel/arch_static_branch_asm.rs"
+    "/rust/kernel/generated_arch_static_branch_asm.rs"
 ));
 
 #[macro_export]
@@ -48,7 +48,7 @@ const _: &str = include!(concat!(
 macro_rules! arch_static_branch {
     ($key:path, $keytyp:ty, $field:ident, $branch:expr) => {'my_label: {
         $crate::asm!(
-            include!(concat!(env!("OBJTREE"), "/rust/kernel/arch_static_branch_asm.rs"));
+            include!(concat!(env!("OBJTREE"), "/rust/kernel/generated_arch_static_branch_asm.rs"));
             l_yes = label {
                 break 'my_label true;
             },